Study on Micromachining of Femtosecond Laser Biomedical Polymer Materials

Abstract:

Femtosecond laser micromachining is a hot topic in the field of micromachining. Femtosecond laser processing of biomacromolecular micro devices has a promising application prospect. The research content of this paper is femtosecond laser micromachining of biomacromolecule materials, aiming at exploring the mechanism of femtosecond laser micromachining. In this paper, the principle of the interaction between laser and polymer materials is briefly expounded, and the photophysical processes such as transition, energy conversion, energy transfer and electron transfer are explained from the molecular orbital, and the mechanism is classified as photothermal and photochemical action, which is manifested as accelerating material's relaxation transformation process and degradation process. The interaction between polymer materials and laser starts from molecules absorbing the energy of photons to complete the transition from ground state to excited state. Different modes of excitation state inactivation correspond to the conversion of light energy into light energy, heat energy or chemical energy. On the one hand, the thermal action leads to the viscoelastic transformation of the material, and the material deforms or flows under the thermoelastic action; on the other hand, the thermal action accelerates the degradation reaction of the polymer material. The carbonyl group on the molecular chain of PMMA and PLA is more likely to reach the excited state, and the chemical properties of the carbonyl excited state determine that the photochemical processes of PMMA and PLA concentrate on the carbonyl group.

• Periodical: Key Engineering Materials (Volume 852)
• Pages: 109-118
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.852.109
• Online since: July 2020
• Authors: Li Ming Fang*, Zheng Qiao, Jing Zhang, Gupta Dharmender Kumar
• Keywords: Femtosecond Laser Micromachining, Photothermal Action, PMMA

References

[1] Hu M F, Xin J, Su H H, et al. Study on laser-assisted dry micro-ground surface of difficult-to-cut materials[J]. International Journal of Advanced Manufacturing Technology, 2018, 94(1):1-10.

DOI: 10.1007/s00170-017-1093-4

[2] Shi X, Li X, Jiang L, et al. Femtosecond laser rapid fabrication of large-area rose-like micropatterns on freestanding flexible graphene films[J]. Scientific Reports, 2015, 5:17557.

DOI: 10.1038/srep17557

[3] Dou J, Sun Y, Xu M, et al. Process research on micro-machining diamond microgroove by femtosecond laser[J]. Integrated Ferroelectrics, 2019, 198(1):9-19.

DOI: 10.1080/10584587.2019.1592571

[4] Tiwary A P, Pradhan B B, Bhattacharyya B . Study on the influence of micro-EDM process parameters during machining of Ti–6Al–4V superalloy[J]. International Journal of Advanced Manufacturing Technology, 2014, 76(1-4):151-160.

DOI: 10.1007/s00170-013-5557-x

[5] Biasetti D A, Liscia E J D, Torchia G A. Optical waveguides fabricated in Cr:LiSAF by femtosecond laser micromachining[J]. Optical Materials, 2017, 73:25-32.

DOI: 10.1016/j.optmat.2017.07.042

[6] Chen X, Zhang W, Liu C , et al. Enhancing the humidity response time of polymer optical fiber Bragg grating by using laser micromachining[J]. Optics Express, 2015, 23(20):25942-25949.

DOI: 10.1364/oe.23.025942

[7] Wu B, Wu X Y, Lei J G, et al. Study on machining 3D micro mould cavities using reciprocating micro ECM with queued foil microelectrodes[J]. Journal of Materials Processing Technology, 2016, 241:120-128.

DOI: 10.1016/j.jmatprotec.2016.11.011

[8] Lin Y, Yao, Ju X, et al. Free-standing double-layer terahertz band-pass filers fabricated by femtosecond laser micro-machining[J]. Optics Express, 2017, 25(21):25125-25134.

DOI: 10.1364/oe.25.025125

[9] Zhang, Ying, Wang, et al. Micromachining features of TiC ceramic by femtosecond pulsed laser[J]. CERAMICS INTERNATIONAL, 2015, 5(41):6525-6533.

DOI: 10.1016/j.ceramint.2015.01.095

[10] Wu J, Cheng J, Gong Y. A study on material removal mechanism of ultramicro-grinding (UMG) considering tool parallel run-out and deflection[J]. International Journal of Advanced Manufacturing Technology, 2019, 103(1-4):1-23.

DOI: 10.1007/s00170-019-03493-9

[11] Wang K, Zhang Q, Liu Q, et al. Experimental study on micro electrical discharge machining of porous stainless steel[J]. International Journal of Advanced Manufacturing Technology, 2017, 90(9-12):1-7.

DOI: 10.1007/s00170-016-9611-3

[12] Dong X, Shin Y C. Improved machinability of SiC/SiC ceramic matrix composite via laser-assisted micromachining[J]. International Journal of Advanced Manufacturing Technology, 2017, 90(1-4):1-9.

DOI: 10.1007/s00170-016-9415-5

[13] Giorleo L, Ceretti E, Giardini C . Optimization of laser micromachining process for biomedical device fabrication[J]. International Journal of Advanced Manufacturing Technology, 2015, 82(5):901-907.

DOI: 10.1007/s00170-015-7450-2

[14] Yang K, Xia Y, Li L, et al. Experimental study on hybrid machining of laser irradiation and grinding for sharpening of a CVD diamond micro-milling tool[J]. The International Journal of Advanced Manufacturing Technology, 2018, 96(1-4):327-336.

DOI: 10.1007/s00170-018-1624-7